Loginshare with Kayako

I'm currently running a Kayako help desk and a separate vBulletin forum, but I'm planning to switch the forum to XenForo in the new year.

I'd really like to integrate the systems to reduce confusion, and I keep reading snippets (like this thread) about loginshare only making the user register on one site or the other, but I can't find much more information about it.

Is that possible? Has anyone actually got that to work between these two systems? Or what options do I have?

I don't know. I sent @ChrisD a message in August, but he hasn't replied yet. I'm tied up with other projects so I've put it on hold at the moment, but I'll be reactivating this project in the spring, so I'd still love to know the answer.